ADG3300 input interfacing

I am trying to find a simple 1.2V to 5V CMOS-CMOS level translator. I was looking at the the ADG3300 but realized that the datasheet states that the input must be driven by a low impedance output (less than 150 ohms). Just wondering where is the application for this? Also any other interfacing options for my application?

While the "Input Driving Requirements" section of the ADG3300 datasheet is correct, the ADG3308 "Input Driving Requirements" section describes the input drive requirements for the ADG330x family better. Below is what it states:

To ensure correct operation of the ADG3308, the circuit that drives the input of the device should be able to ensure rise/fall times of less than 3ns when driving a load consisting of a 6kΩresistor in parallel with the input capacitance of the ADG3308 channel.

The ADG3300 section is more specific and calculated using worst case scenario, while the ADG3308 is more general.

In reality, in the input driving requirements are much less owing to the presence of the one-shots and if the switching speed requirements are low.

Once the Threshold value is achieved, the one shot will kick in and help pull the voltage up or down as required, reducing the required current driving capability.

Thanks for the response. I am still having a lot of problems with this part. All I am looking for is to be able to do translations at a few MHz.

I am testing this product on a board. I am driving it with a 1.2V square wave on one end and looking to get 5V at the other end, observing it with a scope (1Mohm, 24pF).

First of all, I seem to get a lot of what seems like metastability whenever there is a transition, I am not sure whether this is an issue with the one-shots that you mention. I do not use supply coupling on either of the VCC pins, but I doubt this could be problem. It lasts about 0.2usec and then the device is able to resolve the output.

Secondly, the rise and fall times on this seem are so high that I can barely resolve a 200KHz signal. I attached an image of a 100KHz signal observed at the 5V side.

I attached a circuit snippet and also the hacked board picture that I am using to see if this part meets what I need to do. I am using the arbitrary waveform generator of the Digilent analog discovery, they don't layout the drive capability specifically but looking at the architecture, the output of the wave generator is using AD8067 so it should be able to provide 30 mA of current. But again, even at 10KHz, I am seeing these issues.

Attachments

I just want to be sure there are no pull up or pull down resistor on the digital lines going through the level translator that are not shown in this schematic snippet? Pull up/pull down resistors can cause issues using the ADG3300 because of the internal 6k ohm that the device has.

Turns out somehow the probing with the scope I had caused the issues. I switched to more advanced digital scope and voila, working as it should be :/. Still cannot figure out what the issue could possibly be. Scope is marked at 1Mohm, 20pF.